Grand, who's passionate about science and the environment, built his app so he could help lower the CO2 emissions caused by cars. His app, which costs $0.99, works by connecting nearby users who want to car-pool in order to help the environment.

After losing his job and his home about two years ago, Grand told CNN he hopes to get an apartment with the sales from his app.

After 10 people were shot — seven of them in one incident — overnight in Baltimore following the city's most violent month in decades, police announced Sunday that 10 federal agents will embed with the city's homicide unit for the next two months.